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Equity and Liability Components of Notes (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Principal amount of the Notes outstanding | $ 344,610 | $ 387,042
Unamortized discount of liability component | (20,431) | (24,907)
Less: current portion | 490 | 3,245
Long-term debt | 323,689 | 358,890
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of the Notes outstanding | 150,000 | 150,000
Unamortized discount of liability component | (16,418) | (19,372)
Net carrying amount of liability component | 133,582 | 130,628
Less: current portion | 0 | 0
Long-term debt | 133,582 | 130,628
Carrying value of equity component, net of issuance costs | $ 20,993 | $ 20,993
Remaining amortization period of discount on the liability component | 3 years 7 months 6 days | 4 years 3 months 18 days

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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